CN103149406A - Bridge used for direct current insulation monitoring device and running method thereof - Google Patents
Bridge used for direct current insulation monitoring device and running method thereof Download PDFInfo
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- CN103149406A CN103149406A CN2013100394352A CN201310039435A CN103149406A CN 103149406 A CN103149406 A CN 103149406A CN 2013100394352 A CN2013100394352 A CN 2013100394352A CN 201310039435 A CN201310039435 A CN 201310039435A CN 103149406 A CN103149406 A CN 103149406A
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- 238000009413 insulation Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000012806 monitoring device Methods 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 56
- 238000002955 isolation Methods 0.000 claims description 15
- 230000001681 protective effect Effects 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 230000007257 malfunction Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
The invention provides a bridge used for a direct current insulation monitoring device and a running method of the bridge used for the direct current insulation monitoring device. The bridge comprises a balanced bridge and a detection bridge, wherein the balanced bridge is composed of a balanced resistor R1 and a balanced resistor R2, wherein the balanced resistor R1 is connected between a bus positive pole and the earth, and the balanced resistor R2 is connected between a bus negative pole and the earth. The detection bridge is composed of a detection resistor R3, a detection resistor selector switch K1 and/or a detection resistor R4 and a detection selector switch K2, wherein the detection resistor R3 and the detection resistor selector switch K1 are connected between the bus positive pole and the earth, and the detection resistor R4 and the detection resistor selector switch K2 are connected between the bus negative pole and the earth. For the detection resistor R3 connected between the bus positive pole and the earth and the detection resistor R4 connected between the bus negative pole and the earth, at least one of the R3 and the R4 is changeable and controllable. The bridge used for the direct current insulation monitoring device has the advantages of carrying out insulation monitoring by utilization of the detection bridge with the changeable resistor, being capable of changing the resistance value of the detection bridge in a self-adaptation mode according to direct earth capacitance and insulation resistance of a direct current system and taking safety of the direct current system and accuracy of insulation resistance measuring into account.
Description
Technical field
The invention belongs to direct current IT system insulating monitoring field, be specifically related to a kind of electric bridge and operation method thereof for the D.C. isolation monitoring.
Background technology
Be applied to the D.C. isolation monitoring device of transformer station or generating plant, generally to carry out insulating monitoring by balanced bridge with the method that the detection electric bridge combines, detecting electric bridge by input makes electric bridge be in non-equilibrium state, measurement is both positive and negative polarity magnitude of voltage over the ground when non-equilibrium state, utilizes the both positive and negative polarity voltage-to-ground value that measures to calculate the anodal insulation against ground resistance of straight-flow system and negative pole insulation against ground resistance.
Fig. 1 is D.C. isolation monitoring technology principle commonly used at present, wherein, resistance R 1 and resistance R 2 consist of balanced bridge, its resistance equal and opposite in direction, on-off element K1, on-off element K2, resistance R 3 and the common formation of resistance R 4 detect electric bridge, in general, resistance R 3 and resistance R 4 resistance sizes are also equal, and its course of work is:
Closing Switch element K1, cut-off switch element K2 gather the anodal voltage-to-ground U of straight-flow system
1+With negative pole voltage-to-ground U
1-
Cut-off switch element K1, Closing Switch element K2 gather the anodal voltage-to-ground U of straight-flow system
2+With negative pole voltage-to-ground U
2-
The anodal insulation against ground resistance of straight-flow system and negative pole insulation against ground resistance are respectively:
R
+=f
1(U
1+,U
1-,U
2+,U
2-)，
R
-=f
2(U
1+,U
1-,U
2+,U
2-)。
F wherein
1, f
2Be function.Due to the introducing of D.C. isolation monitoring device, the operation that especially detects electric bridge can cause the fluctuation of the anodal voltage-to-ground of dc bus and dc bus negative pole voltage-to-ground, thereby introduces the risk of relay protection of power system malfunction.The voltage fluctuation rate that the ratio of the resistance of detection bridge resistor and the resistance of balanced bridge resistance is causing when determining to detect the electric bridge operation, if detecting the ratio of bridge resistor resistance and balanced bridge resistance is K, the voltage-to-ground stability bandwidth that causes when detecting the electric bridge operation is:
Stability bandwidth under different K values and magnitude of a voltage fluctuation (calculating by straight-flow system voltage 220V) see Table 1:
Table 1
| Multiplying power K | 1 | 2 | 3 | 4 | 5 |
| The maximum fluctuation rate | 16.7% | 10% | 7.14% | 5.56% | 4.55% |
| Fluctuation voltage (V) | 36.7 | 22.0 | 15.7 | 12.2 | 10.0 |
In recent years; cause the Frequent Accidents of protection exit relay malfunction due to the DC loop one point earth; to investigation statistics, theoretical analysis and the simulation test of on-the-spot many protection exit relay malfunction cases of system's operation, draw three principal elements that cause the malfunction of protection exit relay through run unit, research institutions and professional production producer:
(1) straight-flow system negative pole voltage-to-ground surpasses the operation voltage of relay;
(2) ground capacitance of DC system surpasses certain certain value;
(3) the anodal generation of relay coil single-point grounding.
Anti-accident measures requirement according to national grid; the operation voltage of relay is generally 55% ~ 70% of rated operational voltage; in order to overcome the protective relaying maloperation work that causes owing to detecting the electric bridge operation; need guarantee that generally the negative pole voltage-to-ground that the operation of detection electric bridge causes under the system balancing state is no more than 55% of direct supply voltage; the stability bandwidth that namely is controlled under the system balancing state is not more than 5%; like this; controlled first factor in above-mentioned three factors, protective relay can misoperation because reaching operation voltage.So when bridge design, the ratio K that generally will detect bridge resistor resistance and balanced bridge resistance is designed to 4 ~ 5.
But, because fluctuation voltage is low, can causes the insulation resistance accuracy in computation greatly to reduce, thereby affect the supervisory control action performance, and then affect the correct fault judgement of operation maintenance personnel.
Prior art all uses the detection electric bridge of fixed resistance value to carry out the detection of insulation resistance of DC system, if the resistance of detection electric bridge resistance and balanced bridge is larger, the precision of insulation measurement is lower; If the resistance of detection electric bridge resistance and balanced bridge is smaller, the fluctuation of the Bus Voltage that causes in detecting the electric bridge operational process is larger, is difficult to satisfy the security requirement of straight-flow system.
Summary of the invention
A kind of bridge technology and the operation method thereof that the object of the invention is to solve the contradiction of straight-flow system security and insulation measurement accuracy in prior art and provide, its detection bridge resistance is variable, can according to the detection electric bridge of the different resistances of the operation conditions switching of system, take into account straight-flow system security and insulation measurement accuracy.
the invention provides a kind of electric bridge for the D.C. isolation monitoring device, comprise balanced bridge and detect electric bridge, wherein balanced bridge is comprised of the balance resistance that is connected on the balance resistance between bus positive pole and ground and be connected between bus negative pole and ground, detect electric bridge by the detection resistance that is connected between bus positive pole and ground, detect the resistance change-over switch and/or be connected on detection resistance between bus negative pole and ground, detecting the resistance change-over switch forms, be connected on the detection resistance between bus positive pole and ground and be connected on detection resistance between bus negative pole and ground, have at least one to be variable and controlled,
Further, the described detection resistance that is connected on the detection resistance between bus positive pole and ground and is connected between bus negative pole and ground is single resistance;
It is further, described that to be connected on the detection resistance between bus positive pole and ground and to be connected on bus negative pole and detection resistance between ground be through connecting or parallel connection or connection in series-parallel consist of by several resistance.
The present invention also provides a kind of D.C. isolation monitoring device electric bridge operation method, and described method is according to the anodal voltage-to-ground U of straight-flow system
+, negative pole voltage-to-ground value U
-, and ground capacitance of DC system value C
m, carry out the automatic or manual adjusting to detecting resistance.
Further, said method comprising the steps of:
(1) will detect resistance R
jResistance is set to a, and the start detection electric bridge calculates straight-flow system insulation against ground resistance R
+, R
-, and ground capacitance of DC system C
m
(2) calculate the capacitance C that may cause protective relaying maloperation according to the straight-flow system state of step (1) gained and the relay parameter of input
g
(3) with the ground capacitance of DC system C of step (1) gained
mThe capacitance C that may cause protective relaying maloperation with step (2) gained
gCompare, judge whether to cause protective relaying maloperation, if C
m＜C
g, enter step (4), if C
m〉=C
g, export the R of step (1) gained
+, R
-
(4) according to the ground capacitance of DC system C of step (1) gained
mDetermine the detection resistance R of permission
jResistance b;
(5) will detect resistance R
jResistance is set to b, and the start detection electric bridge calculates and export straight-flow system insulation against ground resistance R
+, R
-
The invention has the beneficial effects as follows to adopt and above-mentionedly have variable-resistance detection electric bridge and carry out insulating monitoring, voltage, ground capacitance and insulation resistance according to straight-flow system, the resistance that can adaptively modifying detects electric bridge, the safety of having taken into account straight-flow system is accurate with insulation measurement.
Description of drawings
Fig. 1 is D.C. isolation monitoring principle figure of the prior art;
Fig. 2 is the electrical bridge principle figure in the present invention;
Fig. 3 is the schematic diagram of embodiments of the invention 1;
Fig. 4 is the schematic diagram of embodiments of the invention 2;
Fig. 5 is the schematic diagram of embodiments of the invention 3;
Fig. 6 is that in embodiments of the invention 1-3, variable resistor is implemented schematic diagram;
Fig. 7 is another enforcement schematic diagram of variable resistor in embodiments of the invention 1-3;
Fig. 8 is the process flow diagram of the operation method of electric bridge of the present invention.
Embodiment
Below in conjunction with Figure of description, the present invention is elaborated:
As shown in Figure 2, a kind of electric bridge for the D.C. isolation monitoring device comprises balanced bridge and detects electric bridge that wherein balanced bridge is comprised of the balance resistance that is connected on the balance resistance between bus positive pole and ground and be connected between bus negative pole and ground.
[embodiment 1]
As shown in Figure 3, the first embodiment that is used for the electric bridge of D.C. isolation monitoring device for the present invention, resistance R 1 is connected between the anodal KM+ of dc bus and the earth, resistance R 2 is connected between branch road bus negative pole KM-and the earth, in general, resistance R 1 equates with resistance R 2 resistances, jointly consists of balanced bridge; Resistance R 3 is with after K switch 1 is connected in series, be connected between the anodal KM+ of dc bus and the earth, resistance R 4 is with after K switch 2 is connected in series, be connected between dc bus negative pole KM-and the earth, resistance R 3, resistance R 4, K switch 1, the common formation of K switch 2 detect electric bridge, wherein, resistance R 3 has at least one to be variable, controlled with resistance R 4.
[embodiment 2]
As shown in Figure 4, the second embodiment that is used for the electric bridge of D.C. isolation monitoring device for the present invention, resistance R 1 is connected between the anodal KM+ of dc bus and the earth, resistance R 2 is connected between branch road bus negative pole KM-and the earth, in general, resistance R 1 equates with resistance R 2 resistances, jointly consists of balanced bridge; Resistance R 3 is connected between the anodal KM+ of dc bus and the earth with after K switch 1 is connected in series, and resistance R 3 and K switch 1 be common to be consisted of and detect electric bridge, and wherein, resistance R 3 is variable, controlled.Different from embodiment 1 is that the detection electric bridge of this embodiment only applies between dc bus positive pole and the earth.
[embodiment 3]
As shown in Figure 5, the 3rd embodiment that is used for the electric bridge of D.C. isolation monitoring device for the present invention, resistance R 1 is connected between the anodal KM+ of dc bus and the earth, resistance R 2 is connected between branch road bus negative pole KM-and the earth, in general, resistance R 1 equates with resistance R 2 resistances, jointly consists of balanced bridge; Resistance R 3 is connected between dc bus negative pole KM-and the earth with after K switch 1 is connected in series, and resistance R 3 and K switch 1 be common to be consisted of and detect electric bridge, and wherein, resistance R 3 is variable, controlled.Different with embodiment 2 from embodiment 1 is that the detection electric bridge of this embodiment only applies between dc bus negative pole and the earth.
In above-mentioned three embodiment, the embodiment of variable resistor R3 or variable resistor R4 has following two kinds:
Fig. 6 is the embodiment one of variable resistor R3 or variable resistor R4:
As shown in Figure 6, this embodiment comprises n resistance R 1 ' ... Rn ' and (n+1) individual K switch 0, K1 ' ... Kn ', wherein, R1 ' is in parallel with K1 ', R2 ' is in parallel with K2 ' ... Rn ' is in parallel with Kn ', then R1 ' connects successively to Rn ', and connects with K0, and 2 after series connection are connected between dc bus negative pole (or anodal) and ground (wherein KM can be the dc bus negative or positive electrode).R1 '-Rn ' has identical or different resistance, realizes detecting withdrawing from and dropping into of bridge resistor by disconnection or closed K0, realizes the adjusting of detection bridge resistor by controlling K1-Kn.
Fig. 7 is the embodiment two of variable resistor R3 or variable resistor R4:
As shown in Figure 7, this embodiment comprises n resistance R 1 ' ... Rn ' and n K switch 1 ' ... Kn ', wherein, R1 ' connects with K1 ', R2 ' connects with K2 ' ... Rn ' connects with Kn ', and the branch road after each series connection is connected between dc bus negative pole (or anodal) and ground.R1 '-Rn ' has identical or different resistance, by disconnecting or closed Ki ' (I is 1-n) realizes detecting the adjusting with input and check point resistor bridge withdrawed from of electric bridge.
Fig. 8 is the process flow diagram of the operation method of electric bridge of the present invention:
D.C. isolation monitoring device electric bridge operation method of the present invention comprises the following steps:
(1) will detect resistance R
jResistance is set to a, and the start detection electric bridge calculates straight-flow system insulation against ground resistance R
+, R
-, and ground capacitance of DC system C
m
Take embodiment 1 as example, establish R
1=R
2=R
0, R
3=R
4=R
cK switch
1Closure, K switch
2Disconnect, measure anodal voltage-to-ground U
1+With negative pole voltage-to-ground U
1-K switch
2Closure, K switch
1Disconnect, measure anodal voltage-to-ground U
2+With negative pole voltage-to-ground U
2-, can carry out R according to following formula
+, R
-Calculating:
This process is carried out when dropping into the detection electric bridge simultaneously, before detecting the electric bridge input, and measuring voltage U
0, after detecting the electric bridge input, measure t
1Voltage U constantly
t1, after detecting the electric bridge stabilizing operation, measure steady state voltage U
∞:
T wherein
1: the time point in the capacitor discharge process; U
t1: t
1Magnitude of voltage constantly; U
∞: the magnitude of voltage after discharge is completed; U
0: magnitude of voltage before discharge.
(2) calculate the capacitance C that may cause protective relaying maloperation according to the straight-flow system state of step (1) gained and the relay parameter of input
g
Wherein the straight-flow system state, refer to R
+, R
-And straight-flow system voltage; The relay parameter of input is:
Relay actuation time: t
aActuating of relay voltage: U
aRelay coil internal resistance: R
x
(3) with the ground capacitance of DC system C of step (1) gained
mThe capacitance C that may cause protective relaying maloperation with step (2) gained
gCompare, judge whether to cause protective relaying maloperation, if C
m＜C
g, enter step (4), if C
m〉=C
g, export the R of step (1) gained
+, R
-
(4) according to the ground capacitance of DC system C of step (1) gained
mDetermine the detection resistance R of permission
jResistance b;
(5) will detect resistance R
jResistance is set to b, and the start detection electric bridge calculates and export straight-flow system insulation against ground resistance.
In step (1), ground capacitance of DC system C
mCan record by described start detection electric bridge, also can record by specific purpose tool.
The present invention adopts above-mentionedly to have variable-resistance detection electric bridge and carries out insulating monitoring, and according to voltage, ground capacitance and the insulation resistance of straight-flow system, adaptively modifying detects the resistance of electric bridge, and the safety of having taken into account straight-flow system is accurate with insulation measurement.
Claims (8)
1. electric bridge that is used for the D.C. isolation monitoring device, comprise balanced bridge and detect electric bridge, wherein balanced bridge is comprised of the balance resistance that is connected on the balance resistance between bus positive pole and ground and be connected between bus negative pole and ground, detect electric bridge by the detection resistance that is connected between bus positive pole and ground, detect the resistance change-over switch and/or be connected on detection resistance between bus negative pole and ground, detecting the resistance change-over switch forms, it is characterized in that, be connected on the detection resistance between bus positive pole and ground and be connected on detection resistance between bus negative pole and ground, have at least one to be variable and controlled.
2. electric bridge according to claim 1, is characterized in that, the described detection resistance that is connected on the detection resistance between bus positive pole and ground and is connected between bus negative pole and ground is single resistance.
3. electric bridge according to claim 1, is characterized in that, described to be connected on the detection resistance between bus positive pole and ground and to be connected on bus negative pole and detection resistance between ground be through connecting or parallel connection or connection in series-parallel consist of by several resistance.
4. a D.C. isolation monitoring device electric bridge operation method, be used on the electric bridge of one of claim 1-3, it is characterized in that, described method is according to the anodal voltage-to-ground U of straight-flow system
+, negative pole voltage-to-ground value U
-, and ground capacitance of DC system value C
m, carry out the automatic or manual adjusting to detecting resistance.
5. method according to claim 1, is characterized in that, said method comprising the steps of:
(1) will detect resistance R
jResistance is set to a, and the start detection electric bridge calculates straight-flow system insulation against ground resistance R
+, R
-, and ground capacitance of DC system C
m
(2) calculate the capacitance C that may cause protective relaying maloperation according to the straight-flow system state of step (1) gained and the relay parameter of input
g
(3) with the ground capacitance of DC system C of step (1) gained
mThe capacitance C that may cause protective relaying maloperation with step (2) gained
gCompare, judge whether to cause protective relaying maloperation, if C
m＜C
g, enter step (4), if C
m〉=C
g, export the R of step (1) gained
+, R
-
(4) according to the ground capacitance of DC system C of step (1) gained
mDetermine the detection resistance R of permission
jResistance b;
(5) will detect resistance R
jResistance is set to b, and the start detection electric bridge calculates and export straight-flow system insulation against ground resistance R
+, R
-
6. the method described according to claim 5, is characterized in that, ground capacitance of DC system C in described step (1)
mComputing formula be:
T wherein
1: the time point in the capacitor discharge process; U
t1: t
1Magnitude of voltage constantly; U
∞: the magnitude of voltage after discharge is completed; U
0: magnitude of voltage before discharge.
7. the method described according to claim 5, is characterized in that, the straight-flow system state in described step (2) refers to R
+, R
-And straight-flow system voltage; The relay parameter of input is: relay actuation time, actuating of relay voltage and relay coil internal resistance.
8. the method described according to claim 5, is characterized in that C
mRecord or record by specific purpose tool by described start detection electric bridge.
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|---|---|---|---|
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|---|---|---|---|
| CN201310039435.2A CN103149406B (en) | 2013-01-31 | 2013-01-31 | A kind of electric bridge for D.C. isolation monitoring device and operation method thereof |
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| CN103149406B CN103149406B (en) | 2016-12-07 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103383417A (en) * | 2013-07-24 | 2013-11-06 | 中达电通股份有限公司 | Insulation monitoring method for switching type direct current system |
| CN103576064A (en) * | 2013-10-28 | 2014-02-12 | 惠州市亿能电子有限公司 | Insulation detection circuit with calibration module and calibration method thereof |
| CN105717426A (en) * | 2016-01-29 | 2016-06-29 | 山东鲁能智能技术有限公司 | Insulation monitoring device and method capable of preventing buses from misoperation |
| CN105823954A (en) * | 2015-01-05 | 2016-08-03 | 深圳奥特迅电力设备股份有限公司 | Detection device for grounding point of storage battery pack, method and DC power supply system |
| CN105842540A (en) * | 2016-03-23 | 2016-08-10 | 中车株洲电力机车研究所有限公司 | Method for detecting DC bus insulation resistance |
| CN106291112A (en) * | 2016-10-27 | 2017-01-04 | 宁德时代新能源科技股份有限公司 | Insulation resistance detection circuit and method |
| CN106483422A (en) * | 2016-11-30 | 2017-03-08 | 国网江苏省电力公司连云港供电公司 | A kind of DC grounding monitor instrument |
| CN106842070A (en) * | 2017-02-04 | 2017-06-13 | 山东鲁能智能技术有限公司 | Direct current mutually alters detecting system and method between a kind of different straight-flow systems |
| CN111650450A (en) * | 2020-04-03 | 2020-09-11 | 杭州奥能电源设备有限公司 | Identification method based on direct current mutual string identification device |
| CN112147477A (en) * | 2020-09-25 | 2020-12-29 | 杜吉飞 | New energy automobile direct current charging equipment insulation monitoring system and method |
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| CN103383417A (en) * | 2013-07-24 | 2013-11-06 | 中达电通股份有限公司 | Insulation monitoring method for switching type direct current system |
| CN103576064A (en) * | 2013-10-28 | 2014-02-12 | 惠州市亿能电子有限公司 | Insulation detection circuit with calibration module and calibration method thereof |
| CN103576064B (en) * | 2013-10-28 | 2016-08-24 | 惠州市亿能电子有限公司 | A kind of Insulation monitoring calibration steps with calibration module |
| CN105823954B (en) * | 2015-01-05 | 2023-04-18 | 深圳奥特迅电力设备股份有限公司 | Detection device and method for grounding point of storage battery pack and direct-current power supply system |
| CN105823954A (en) * | 2015-01-05 | 2016-08-03 | 深圳奥特迅电力设备股份有限公司 | Detection device for grounding point of storage battery pack, method and DC power supply system |
| CN105717426A (en) * | 2016-01-29 | 2016-06-29 | 山东鲁能智能技术有限公司 | Insulation monitoring device and method capable of preventing buses from misoperation |
| CN105842540A (en) * | 2016-03-23 | 2016-08-10 | 中车株洲电力机车研究所有限公司 | Method for detecting DC bus insulation resistance |
| CN106291112A (en) * | 2016-10-27 | 2017-01-04 | 宁德时代新能源科技股份有限公司 | Insulation resistance detection circuit and method |
| CN106291112B (en) * | 2016-10-27 | 2019-06-18 | 宁德时代新能源科技股份有限公司 | Insulation resistance detection circuit and method |
| CN106483422A (en) * | 2016-11-30 | 2017-03-08 | 国网江苏省电力公司连云港供电公司 | A kind of DC grounding monitor instrument |
| CN106842070A (en) * | 2017-02-04 | 2017-06-13 | 山东鲁能智能技术有限公司 | Direct current mutually alters detecting system and method between a kind of different straight-flow systems |
| CN111650450A (en) * | 2020-04-03 | 2020-09-11 | 杭州奥能电源设备有限公司 | Identification method based on direct current mutual string identification device |
| CN111650450B (en) * | 2020-04-03 | 2022-07-15 | 杭州奥能电源设备有限公司 | Identification method based on direct current mutual string identification device |
| CN112147477A (en) * | 2020-09-25 | 2020-12-29 | 杜吉飞 | New energy automobile direct current charging equipment insulation monitoring system and method |
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